Kyle Terada-USA TODAY Sports

After the Nationals scored one run in each of the past two games, Manager Matt Williams mixed up his lineup. Greg Dobbs is playing first base and Zach Walters gets his career start at third base. Both will hit left-handed against Pirates right-hander Charlie Morton. The Nationals have been getting handled lately by right-handed starters.  Oddly, though, Morton has reverse splits. Lefties have a .613 OPS against him, and right-handed batters have a .706 OPS against him this season.

Nationals

1. Denard Span, CF

2. Anthony Rendon, 2B

3. Jayson Werth, RF

4. Wilson Ramos, C

5. Ian Desmond, SS

6. Greg Dobbs, 1B

7. Zach Walters, 3B

8. Nate McLouth, LF

9. Jordan Zimmermann, SP

Pirates

1. Josh Harrison, RF

2. Neil Walker, 2B

3. Andrew McCutchen, CF

4. Ike Davis, 1B

5. Russell Martin, C

6. Pedro Alvarez, 3B

7. Starling Marte, LF

8. Clint Barmes, SS

9. Charlie Morton, SP